381. Oxide of which of the following will turn red litmus blue?

1. Magnesium
2. Phosphorus
3. Sulphur
4. Carbon

Option “1” is correct
Magnesium oxide is mild base therefore it turn red litmus blue while oxides of Sulphur,Phosporus and Carbon are acidic in nature so they did not effect red litmus but turn blue litmus into red.
382. Which of the following are highly compressible?

1. Solid
2. Liquid
3. Gas
4. Solid and Liquid

Option “3” is correct
In a gas, the particles are very far away from each other, so there is a lot of space for the particles to be compressed down in to. Thus Gases are highly compressable.This is very helpful when transporting gases in containers.
383. _________ gets converted to phosgene, when exposed to sunlight.

1. Chloroform
2. Acetone
3. Benzene
4. Propylene

Option “1” is correct
Phosgene can form from chloroform, in presence of oxygen and UV light.
384. Carnotite is an ore/mineral of _________.

1. Beryllium
2. Chromium
3. Uranium
4. Copper

Option “3” is correct
Carnotite an important uranium ore.
385. Malachite is an ore/mineral of –

1. Lead
2. Manganese
3. Mercury
4. Copper

Option “4” is correct
Malachite is an ore/mineral of copper.
386. Which among the following will be a negative ion?

1. If it has more electrons than protons
2. If it has more electrons than neutrons
3. If it has more protons than electrons
4. If it has more protons than neutrons

Option “1” is correct
Negative ion which is created by an electron gain and it has more electrons than protons.
387. Which chemical is used in ripening mangoes artificially?

1. Sulphur Dioxide
2. Nitrous Oxide
3. Calcium Carbide
4. Phosphorous

Option “3” is correct
The chemical widely used for artificially ripening fruits is Calcium Carbide (CaC2).
388. What is the pH of water?

1. 7
2. 5
3. 3
4. 1

Option “1” is correct
The pH of water is 7.
389. Solid carbon dioxide is known as ________.

1. Hypo
2. Borax
3. Alum
4. Dry ice

Option “4” is correct
Solid carbon dioxide is known as Dry Ice.
390. Beryl is an ore/mineral of –

1. Nickel
2. Beryllium
3. Lead
4. Tin

Option “2” is correct
Beryl is an ore/mineral of Beryllium.
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11 thoughts on “Chemistry”

  6. Dolly

    I Love chemical…it’s my favourite subject..mere iss mein se hmesha hi boht ache marks aate hai….and my interest is also in chemistry…

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